Page 16 - TOP CLASS MATHS T5 KSSM

Mathematics Form 5 Chapter 7 Measures of Dispersion for Grouped Data

(a) Time (minutes)
Masa (minit) 61 – 70 71 – 80 81 – 90 91 – 100 101 – 110 111 – 120 121 – 130
Frequency 7 11 18 23 17 12 8
Kekerapan

Time (minutes) Frequency Upper boundary Cumulative frequency
Masa (minit) Kekerapan Sempadan atas Kekerapan longgokan
51 – 60 0 60.5 0
61 – 70 7 70.5 7
71 – 80 11 80.5 18
81 – 90 18 90.5 36
91 – 100 23 100.5 59
101 – 110 17 110.5 76
111 – 120 12 120.5 88
121 – 130 8 130.5 96

Cumulative frequency
Kekerapan longgokan

100

90 1
(i) × 96 = 24
4
From the ogive,
80
Daripada ogif,
Q 1 = 84.5 minutes / minit
70 1
(ii) × 96 = 48
2
60 From the ogive,
Daripada ogif,
Q 2 = 95.5 minutes / minit
50
(iii) 3 × 96 = 72
40 4
From the ogive,
Daripada ogif,
30 Q 3 = 107.5 minutes / minit
60
(iv) × 96 = 57.6  58
20 100
From the ogive,
Daripada ogif,
10
P 60 = 99.5 minutes / minit

0
60.5 70.5 80.5 90.5 100.5 110.5 120.5 130.5
Time (minutes)
Masa (minit)

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